Stop-motion.



J. L. JACKSON.

STOP MOTION.

APPLIOATION FILED SEPT. 27, 1910.

Patented Dec. 10, 191.2.

W/ T/VESSES:

'" TED STATES PATENT orr on.

JOSEPH L. JACKSON, GLASTONBURY, QONNECTICUT.

Specification of Letters Patent.

Application filed September 27, 1910. Serial No. 584,011.

To all whom it may concern: Be it known that I, JOSEPH L. J AGKSON, a citizen of the United States, and a resident of Glastonbury, in the county of Hartford and State of Connecticut, have invented new and useful Improvements in Stop-Motions, of which the following is a specification.

My invention relates more particularly to warp stop motions of the electrical type, and is illustrated in connection with a harness loom, although it is susceptible for use with' looms of other. kinds.

.Referring to the drawings: Figure 1 is a front view of a portion of a loom in which the invention is embodied. Fig. 2 is a detail perspective view of a part of the device constituting the invention. Fig. 3 is a top view of a portion of a heddle bar. Fig. 4 is a side view of the same showing the connection open. Fig. 5 is a transverse sectional view on the line 5, a view similar to Fig. 4 showing the connection closed. Fig. 7 is a transverse sectional view on the line 7, 7 of Fig. 6. Fig. 8 is a View showing somewhat diagrammatically a knock-off mechanism forming part of the stop motion.

Referring to the drawings (1 denotes a part of the frame of a loom, b a harness, 0 the upper heddle bar, d the lower heddle bar, and e are the heddles, which may be of any well-known form such as theordinary wire heddles.

The invention consists in means which are made operative when one of the warp threads breaks for moving a part of a knock-off device into the path of a moving part of the loom in order; that the knock-0E .device may be operated to stop the loom.

In carrying out my invention I make use of an upper. heddle bar of peculiar'construction'. It comprises t o-strips of conducting material 1, 2, extending throughout the length of the barand embedded in and separated from each other by insulating material 3, these strips being wholly. protected by said insulating material "except along their upper edges which are exposed.

Supported on insulating standards 10, 11, at the side of the machine are bars 12, 13, of conducting material, and to one of these bars, 12 one of the conducting strips 1 of the heddle bar is electrically connected as by the wire 14. To the other bar 13 there is secured a sprin'g'15 which'at its other end 5 of Fig. 4. Fig. 6 is carries a contact finger 16 which is pivoted to the insulating material 3"0f the heddle bar as indicated at 17 in Figs. 4 and 5. A clip 18 is formed atthe end of thestrip 2' adjacent to the contact finger 16 which is adapted to enter said clip when the frame is in its low position as indicated inFi 6.

By reference to Fig. 1 it will be noted that when the harness is in its upper position the spring 15 Willcause the contact finger 16 to be withdrawn from the clip 18 ,and thus break the circuit between the strip 2 and the bar 13. These bars 12, 13 are connected into a circuit including a source of electric energy such as a battery indicated at 19,

and which leads to a knock-off mechanism,

one frame of which is conventionally shown in Fig. 8 in which 20 denotes the latch connectedwitha starting handle 21, and m is a magnet connected with saidlatch. 22 represents the lay and 23 a bumper carried by the lay. 1

While the machine is running with all the warp threads intact, each warp thread holds its heddle up ofl" of the 'upper heddle bar when the harness is in its low position, which means that there is no electrical con- Patented Dec. 10, 1912.

nection between the two strips ofconducting material embedded inthe upper heddle bar. If however one of the warp threads breaks. the heddle drops so that its upper loop rests on the upper heddle bar as indi- --cated ate in Fig.1, with the result that when the harness is in its low position with the contact points 16 engaging the clip 18,, the electric circuit is closed. This energizes the magnet m drawing down the latch 20 into the path of movement ofthe bumper, 23

and the lay 22, and at the next movement of the lay this bumper is engaged and the starting handle 21 is thrown over to the opposite position from that shown in Fig. 8, and the loom is stopped. As soon as. the warp thread is repaired the starting lever' is thrown back to the position of 'Fig. 8 and the loom is again thrown into operation and will continue until another warp thread breaks, allowing its heddle to close the ciris again energized to bringthe knock-ofi mechanism into operation.

It is of course apparent that by simple alteration the spring 15 can be connected with the strip'2 and the circuit can be made cuit between the strips 1, 2, and when the harness reaches its low position the magnet and broken at the bar 13. I am also aware heddle bars of insulating material, a pair of conducting strips embedded therein with their upper edges exposed, conductor bars arranged at the side of the machine on insulated supports and connected into an electric circuit, an electric connection from one strip to one bar, a spring member secured at one end to the. other bar and at the other end pivotally connected with the heddle bar, a contact clip on the other strip adapted to be engaged by the end of said spring at the low position of the harness, heddles having eyes through whichsaid heddle bar passes and adapted to electrically connect said strips when a warp thread breaks, and a knock-off device arranged in operative relation with the loom driving mechanism and having apart normally held out of operative position, and a device included in said circuit and adapted to operate said part when the circuit is closed.

2. In a device of the character described a loom frame, a plurality of harness, a heddle bar of insulating material for each harness, a pair of conducting strips embedded in each of said heddle bars with their upper edges exposed, a pair of conductor bars arranged at the side of the machine on insulated supports and connected into an electric circuit, electric connections from one of said bars to one conducting strip of each heddle bar, spring members secured at one end to the other bar and at their oppositeends pivotally connected with each heddle bar, contact clips on the other strip of each heddle bar adapted to be engagedby the ends of said springs when the harness is in its low position, a set of heddles for each harness having eyesthrough which the heddle bars pass, and adapted to electrically connect the conducting'strip of each heddle bar when a warp thread breaks, a knock-off device arranged in operative relation with the loom driving mechanism and having a part normally held out of operative position,

and a device included in said circuit and adapted to operate said partwhen the cir-' cuit is closed. v

3. In a loom the combination with a frame, harness, upper and "lower heddle bars, heddles and warp threads, loom driving mechanism and a knock-ofi' device associated therewith and having a part normally held out of operative position, of a pair of electric chine and connected into an electric circuit,

a pair of conducting strips embedded in one G. B. LYNCH, H. E. HART.

the other bar and having its opposite conductors arranged at the side of the ma connection 'be- F 

